On Sunday, April 03, 2011 05:15:32 PM Kirk Wallace did opine: > On Sun, 2011-04-03 at 10:52 -0400, gene heskett wrote: > ... snip > > > I would have a hard time justifying an idling current draw of 35 amps > > a leg from the 240 to run a 3 horse motor on the machine. > > This links covers a remote start setup: > http://homemetalshopclub.org/projects/phconv/phconv.html > > This one is new to me: > http://hmin.tripod.com/als/andysm/pages/3phase02.html > > looks similar to John's schematic. > > I used this link for mine: > http://www.metalwebnews.com/howto/ph-conv/ph-conv.html > > It seems that if I were clever enough, there might be a way to have a > low voltage on the converter output that could sense when a machine is > turned on, then start the converter, switch in the high voltage, then > shut down when no load is sensed. My converter is close to the machine I > use it with, so I just turn it on and off as needed.
I'm sure such a gizmo could be designed. The problem is in protecting the sensor from the 30x higher operating voltage. Not to mention that what I could come up with in just a few seconds thought, is probably going to waste at least 5 watts on a 24/7 basis, not a good idea in some locales. -- Cheers, Gene "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) <http://tinyurl.com/ddg5bz> <http://www.cantrip.org/gatto.html> "Our reruns are better than theirs." -- Nick at Nite ------------------------------------------------------------------------------ Create and publish websites with WebMatrix Use the most popular FREE web apps or write code yourself; WebMatrix provides all the features you need to develop and publish your website. http://p.sf.net/sfu/ms-webmatrix-sf _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
